Irregular period while weaning?

Currently breastfeeding my 14mo old only in the morning and evenings, just following his lead for a slow and gradual wean. I did not get my period back until he was almost 12 months. Since then, this is my 4th period.

I had my first period, then about 4 weeks later had the second, then about 2 weeks after that had it again, and now about 3ish weeks after that I got it again.

Is it normal for periods to be this irregular while still breastfeeding? Prior to pregnancy, I averaged 30-32 day cycles.